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首页> 外文会议>World Organization of Dredging Associations(WODA) World Dredging Congress; 20070527-0601; Lake Buena Vista,FL(US) >MODELING THE ULTIMATE TRANSPORT AND FATE OF DREDGE-INDUCED SUSPENDED SEDIMENT TRANSPORT AND DEPOSITION
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MODELING THE ULTIMATE TRANSPORT AND FATE OF DREDGE-INDUCED SUSPENDED SEDIMENT TRANSPORT AND DEPOSITION

机译：建模的泥沙诱发悬浮泥沙运输和沉积的最终运移和命运

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摘要

SSFATE (Suspended Sediment FATE) is a computer model originally developed jointly by the U.S. Army Corps of Engineers Engineer Research and Development Center and Applied Science Associates to estimate the water column suspended sediment concentrations and bottom deposition patterns resulting from dredging operations. The model requires specification of circulation in the area of interest, the type of dredging technology used, and the loss rate and vertical distribution of initial material release. Using a random walk procedure, the model tracks representative particle classes as they disperse in the water column and settle to the bottom. Model output includes water column suspended sediment concentrations and bottom deposition thicknesses.The model originally tracked only the initial deposition of sediment on the bottom as the local shear stress dropped below the critical deposition threshold. If the velocity (and shear stress) subsequently increased, the sediments were not resuspended. To expand the capability of the model to include resuspension and thus transport of suspended sediment after initial deposition, a two step resuspension algorithm was implemented.The expanded model was tested to prove the concept for a simple channel configuration and an actual coastal application. Comparisons between the original nonresuspension version and the updated resuspension version were made for both applications. The addition of the resuspension calculation tended to cause a larger areal bottom deposition pattern and increased the maximum concentration away from the dredging site. The model provides consistent and reasonable results but remains to be tested against actual field data. Future work will concentrate on locating suitable data sets to verify model performance.
机译：SSFATE（悬浮泥沙FATE）是最初由美国陆军工程兵工程研发中心和Applied Science Associates联合开发的一种计算机模型，用于估算因疏operations作业而引起的水柱悬浮泥沙浓度和底部沉积模式。该模型要求指定感兴趣区域的流通量，使用的挖泥技术类型以及初始物料释放的损失率和垂直分布。该模型使用随机游走程序跟踪代表性的粒子类别，因为它们分散在水柱中并沉降到底部。该模型的输出包括水柱中悬浮沉积物的浓度和底部沉积物的厚度。该模型最初只跟踪底部沉积物的初始沉积，因为局部切应力降至临界沉积阈值以下。如果速度（和剪切应力）随后增加，则沉积物不会重新悬浮。为了扩展该模型的能力，使其能够包括重悬，从而在初始沉积后传输悬浮的泥沙，实施了两步重悬算法，并对该扩展模型进行了测试，以证明该概念适用于简单的航道配置和实际的沿海应用。两种应用程序都对原始的非重悬浮版本和更新的重悬浮版本进行了比较。重新悬浮计算的增加趋向于导致更大的面积底部沉积图案并增加远离挖泥现场的最大浓度。该模型可提供一致且合理的结果，但仍有待针对实际现场数据进行测试。未来的工作将集中在查找合适的数据集以验证模型性能上。

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